In a message dated 3/27/2006 10:07:13 P.M. Central Standard Time,
hagargs@earthlink.net writes:
I have run the engine several times in the driveway. This weekend I have
run it fully cowled up to check temperatures. Things looked good at leat for
the length of time I ran it without disturbing the neighbors too much. I had
several comments to the fact that "at least its not as loud as a Harley". So
I guess I am OK as there are several of them in the neighborhood. Had to
re-adjust the throttle stop to find a happy medium between having the choke
circuit work upon starting and high rpm level required to keep the gearbox from
chattering. 1700 rpm seems to be about it.
However the only fault discernable the 5 times or so that I ran it was that
I got a backfire of one loud pop every time I stopped the engine. This did
not happen on the previous runs. I stopped the engine per the Rotax tech"s
suggestion of turning one mag off first then killing the engine finally off
the remaining mag. Has anyone seen this on their 914?
I have posted some photos of N40SH A143 on the builder's log on the
builder's gallery it is the last album with 8 photos. It is untitled as I
had
some problems naming it. Hope to be flying before it gets too hot.
Steve Hagar
A143 Mesa, AZ
Steve,
We always shut our 914 down by turning both mags off at the same time. The
only time we got a backfire was when we were running too lean. The mags are
timed differently so depending on which one you shut down first, your engine
may not be running with the proper mixture. Also, the owner's manual has
this to say "Allow a cooling run of at least 1 min. as an engine shut-off at
high temperature is especially harmful for the turbo charger. Carburizing oil
might block the oil supply and firing in the muffler can occur."
Tam
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